Nisar, Fahid, Hafiz Muhammad Aamir, Muhammad Suleman Tahir, and Abdul Hannan Zahid. “Methods of Controlling Smog in Pakistan”. Journal of the Pakistan Institute of Chemical Engineers 47, no. 2 (April 19, 2020): 25–33. Accessed July 23, 2024. http://piche.org.pk/journal/index.php/jpiche/article/view/437.